=200

U can use addition multiplication

or just use ur mind

addition

20+20+20+20+20+20+20+20+20+20

or

multiplication

20x10

or using ur mind

10 only has 1 zero

add zero to 20

is 200

example

200 x 100

move 2 zeros into 200 that will be 20,000

easy

Answer:

200.

Step-by-step explanation:

If your friend constantly collected 20 plastic bottles per days up to 10 days:

10 (days) x 20 (plastic bottles) = 200 (ten days worth of collecting plastic bottles)